Question

Which of the following species has the highest electron gain enthalpy ?

• A. $F^{-}$
• B. $O$
• C. $O^{-}$
• D. $N{a}^{+}$

Answer 1

Answer: (B)

$O$

Answer : A

In general , electron gain enthalpy becomes more and more negative from left to right in a period. This is due to decreases in size and increase in nuclear charge as the atomic number increases in a period. Both these factors favor the addition of an extra electrons due to higher forces of attraction by the nucleus for the incoming electron.So F- will have the highest electron gain enthalpy.